<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>

<body>
    <div id="app"></div>
    <script type="text/babel">
        class App extends React.Component {
            //state状态的改变会触发render调用
            state = {
                count: 0,
                content: "类式组件"
            }
            render() {
                console.log("render了");
                const {count} = this.state
                return (
                    <div>
                        <button onClick={this.handle}>+</button>
                        <p>{count}</p>
                    </div>
                )
            }
            //事件函数
            handle = () => {
                //组件实例上有一个setState方法,接收一个对象,会把接收的对象和原始的state对象进行合并,并重新渲染
                this.setState({count:1,isHot:true})
                this.setState({isXiake:false})

                console.log("this.state.count",this.state.count);//0
            }
        }
        

        const root = ReactDOM.createRoot(document.getElementById("app"))
        root.render(<App />)


    </script>
</body>

</html>